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herder.de

https://herder.de· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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herder.de
Desktop screenshot of herder.de
Mobile screenshot of herder.de
Mobile

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Hosting Provider

Microsoft Azure
azure.microsoft.com

IP Address

98.67.147.107

Site Location

🇩🇪 Germanyvia phone

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS8075

Organization

Microsoft Azure Cloud (germanywestcentral)

Nameservers

ns3.herdernet.de.ns2.herdernet.de.ns1.herdernet.de.ns4.herdernet.de.

Performance

96

Core Web Vitals

Weight

First Contentful Paint
1.1 s10%
Speed Index
1.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2.6 MB
142 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Sitecore

Progressive Web App

PWA ReadyWeb ManifestService WorkerApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

UI Components

1
Fancybox

Other

1
lazysizes

Other

1
Modernizr

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Advertising

1
Google Ads

Customer Support

1
Zendesk

SEO Analysis

B77/100
21
6
1
Meta Tags13/15
Content11/12
Headings3/8
Technical23/25
E-E-A-T5/7
Images5/7
Links4/5
URL5/5
Social1/5
Freshness0/4
Mobile4/4
Indexability3/3
H
herder.deherder.de

Herder.de | Bücher auf Rechnung | Themen | Zeitschriften

Bücher und Zeitschriften aus dem Verlag Herder: Online lesen und kaufen ➤ Herder.de

Title Length56 chars

Recommended: 50-60 chars (~336px / 580px)

Description Length83 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing H1 tag — every page should have exactly one H1

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

38 URLs

38 sub-sitemaps

robots.txt

8 rules

Sitemap reference found

Local SEO

Local Search Readiness

24/100
Needs Work
7 10

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AI & LLM Readiness

F37/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
3/25
Citation
7/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:3%
Words:2,284
Token eff.:Optimal

Structured Data

1 JSON-LD
Organization×1.1
sameAs entity links

Citation Readiness

Opening Summary
Descriptive Headingsavg 2.5w
Canonical URL
Open Graph1/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...
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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
73/100
12
Passed
0
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
2/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
13/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
3/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •Accessibility recommendation preview...
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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
48/100
D
271 mg
CO₂e / view
2.6 MB
Page Weight
30%
Cleaner Than
New Visitor
310 mg
vs
Returning (cached)
155 mg
Annual (10K/mo)
32.5 kg
Emission Segments
Data Center
13 mg
Network
80 mg
Device
178 mg
Resource Breakdown
JavaScript
144.7 KB
Images
1.3 MB
CSS
768.7 KB
Fonts
315.7 KB
HTML
79.2 KB
Other
438 B
Green Hosting Verified
Microsoft Azure
Provider Match
7 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

255d

Certificate Details

Type

Extended Validation (EV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

08.12.2025

Valid Until

08.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.herder.deherder.de

SHA-256 Fingerprint

C4:51:8A:E7:09:7F:D7:6B:61:8F:8B:F9:B0:1C:8B:1A:3A:B1:98:EE...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ch
Sec-CH-UA-Full-Version-List,Sec-CH-UA-Platform-Version,Sec-C...
cache-control
🔴 No Cache(no-cache, no-store)
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=utf-8
date
Tue, 28 Apr 2026 11:38:04 GMT
expires
-1
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

98

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

herder-de.mail.protection.outlook.com

Domain Information

herder.de

Last Updated

26.11.2021

DNSSEC
Not Enabled

Privacy & Compliance

Usercentrics

Cookie Consent Banner
Usercentrics
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Usercentrics
Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
C
67/100
Mobile Friendly
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1.0
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Open Sans

WCAG Partial
72/100
Readability
/30
20/30

16px · LH 1.65

Hierarchy
/20
20/20

2.81x ratio · ✓ H1→H6

WCAG
/25
16/25

3.66:1 min contrast

Performance
/25
16/25

1 font · 14 req

Heading Font

Open Sans

Sans45px

Body Font

Open Sans

Sans16px

Contrast Ratio

3.66:1

1 issue

Reading Comfort

~35 CPL

Narrow lines
45px
h1
45px
h2
18px
h3
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 3.7:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.8x larger than body text.

✅ Lean font stack: 1 font families keeps load times fast.

Buy on MyFontsFlesch 0

Color Palette

8 unique colors
6.12:1 AA Light
#ffffff
Primary· 41.3%
#5e6455
Secondary· 6.3%
#73bee6
Accent· 25.799999999999997%
#ead4bc
Accent· 6.2%
#97cbd3
Secondary· 3%
#789cac
Secondary· 2.7%
#8cb8d2
Secondary· 2.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

19 Resources

18
Scripts
1
Styles
12
Async
1
Defer

Top Script Sources

googletagmanager.com(8)local(6)fast.smarketer.de(2)app.usercentrics.eu(2)

Website Identity

Verlag Herder

Verlag Herder

Organization
aboservice@herder.de
+497612717300
www.herder.de
Location detected: 🇩🇪 Germanyvia phone
📧 Microsoft 365de

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Last analyzed: 28 Apr 2026 at 11:38

Historical Analysis & Change Tracking